Choose all items which are true. The point (2.8) is on the graph of x + 2y = 20.
The point (-1,5) is on the graph of x + 2y = 10.
The point (7.7) is on the graph of 2x - y = 7.
The point (7.-7) is on the graph of 3x + y = 14
The point (1, 1) is on the graph of 2x + 6y = 8.

phosphate, calcium ion, chloride ion, neon atom

step-by-step explanation:

16.9 times 2.85

step-by-step explanation:

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads